require 'button'

  button_handlers = {}

  love.graphics.setColor(1, 1, 0)
  love.graphics.rectangle('fill', 1, 1, 400, 10*12)

  local y = 0

    y = y+25

    love.graphics.draw(text, 12, i*15)

    if line == '' then
      button('draw', {x=4,y=y+4, w=12,h=12, color={1,1,0},
        icon = function(x, y)
                 love.graphics.setColor(0.7,0.7,0.7)
                 love.graphics.rectangle('line', x,y, 12,12)
                 love.graphics.line(4,y+6, 16,y+6)
                 love.graphics.line(10,y, 10,y+12)
                 love.graphics.setColor(0, 0, 0)
               end,
        onpress1 = function()
                     table.insert(lines, i, {y=y, w=400, h=200, pending={}, shapes={}})
                   end})
    elseif type(line) == 'table' then
      -- line drawing
      love.graphics.setColor(0,0,0)
      line.y = y
      love.graphics.rectangle('line', 12,y, line.w,line.h)
      y = y+line.h
      for _,shape in ipairs(line.shapes) do
        prev = nil
        for _,point in ipairs(shape) do
          if prev then
            love.graphics.line(prev.x,prev.y, point.x,point.y)
          end
          prev = point
        end
      end
      prev = nil
      for _,point in ipairs(line.pending) do
        if prev then
          love.graphics.line(prev.x,prev.y, point.x,point.y)
        end
        prev = point
      end
    else
      love.graphics.draw(text, 25,y, 0, 1.5)
    end

  love.graphics.print('_', 12+text:getWidth(), #lines*15)

  love.graphics.print('_', 25+text:getWidth()*1.5, y)

  if love.mouse.isDown('1') then
    for i, line in ipairs(lines) do
      if type(line) == 'table' then
        local y = love.mouse.getY()
        if y >= line.y and y < line.y + line.h then
          lines.current = line
          process_drag(line,love.mouse.getX(),love.mouse.getY())
        end
      end
    end
  end
end
function process_drag(drawing, x,y)
  table.insert(drawing.pending, {x=x, y=y})

function love.mousereleased(x,y, button)
  if lines.current then
    if lines.current.pending then
      table.insert(lines.current.shapes, lines.current.pending)
      lines.current.pending = {}
      lines.current = nil
    end
  end
end

end
function love.mousereleased(x, y, button)

  propagate_to_button_handers(x, y, button)

button_handlers = {}
-- draw button and queue up event handlers
function button(name, params)
  love.graphics.setColor(params.color[1], params.color[2], params.color[3])
  love.graphics.rectangle('fill', params.x,params.y, params.w,params.h, 5,5)
  if params.icon then params.icon(params.x, params.y) end
  table.insert(button_handlers, params)
end
-- process button event handlers
function propagate_to_button_handers(x, y, button)
  for _,ev in ipairs(button_handlers) do
    if x>ev.x and x<ev.x+ev.w and y>ev.y and y<ev.y+ev.h then
      if ev.onpress1 and button == 1 then ev.onpress1() end
    end
  end
end